Internal Server Error while trying to browse Horde webmail

Refers to:

  • Plesk 12.5 for Linux
  • Plesk 11.5 for Linux
  • Plesk 12.0 for Linux

Created:

2016-11-16 12:39:43 UTC

Modified:

2016-12-21 18:54:50 UTC

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Internal Server Error while trying to browse Horde webmail

Symptoms

Horde webmail login fails with an error:

500 Internal server error.

The following error appears in /var/log/httpd/suexec.log :

[2014-08-10 21:35:00]: uid: (10057/horde_sysuser) gid: (2521/horde_sysgroup) cmd: cgi_wrapper
[2014-08-10 21:35:00]: target uid/gid (10057/2521) mismatch with directory (0/0) or program (0/0)

The following error appears in /var/log/httpd/error_log :

suexec policy violation: see suexec log for more details
[Fri Aug 08 22:22:53 2014] [warn] [client 203.0.113.2 ] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Fri Aug 08 22:22:53 2014] [error] [client 203.0.113.2 ] Premature end of script headers: index.php

Cause

File /usr/sbin/suexec is corrupted.

Resolution

Take the binary from Plesk files:

# mv /usr/sbin/suexec /usr/sbin/suexec.orig
# cp /usr/lib64/plesk-9.0/suexec/psa-suexec /usr/sbin/suexec
# chown root:apache /usr/sbin/suexec
# chmod 4510 /usr/sbin/suexec
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